CMMVC8783E The volume copy was not deleted because the volume is part of a consistency group.
Explanation
A volume copy cannot be deleted when it is part of an active-active relationship.
User response
First, verify that you specified the correct volume copy. If not, retry the command with a volume copy that is not part of a consistency group.
If you specified the correct volume copy, remove the active-active relationship for the volume from the consistency group, then retry the command.